remove division from main loop

minkcv · Dec 30, 2018 · eca9030 · eca9030
1 parent 2c32b88
commit eca9030
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Showing 3 changed files with 17 additions and 17 deletions.
diff --git a/Makefile b/Makefile
@@ -41,7 +41,7 @@ ICON		:=	icon.jpg
 
 APP_AUTHOR	:=	Will Smith
 APP_TITLE	:=	Vapor Spec
-APP_VERSION	:=	0.4.1
+APP_VERSION	:=	1.0.0
 
 #---------------------------------------------------------------------------------
 # options for code generation

diff --git a/source/display.h b/source/display.h
@@ -3,7 +3,6 @@
 
 #include "constants.h"
 #include "gpu.h"
-#include <SDL2/SDL.h>
 #include <EGL/egl.h>    // EGL library
 #include <EGL/eglext.h> // EGL extensions
 #include <glad/glad.h>  // glad library (OpenGL loader)
@@ -20,8 +19,8 @@ layout(location = 1) in vec2 a_texCoord;
 out vec2 v_texCoord;
 void main()
 {
-	gl_Position = a_position;
-	v_texCoord = a_texCoord;
+    gl_Position = a_position;
+    v_texCoord = a_texCoord;
 }
 )text";
 
@@ -35,7 +34,7 @@ layout(location = 0) out vec4 outColor;
 uniform sampler2D s_texture;
 void main()
 {
-	outColor = texture(s_texture, v_texCoord);
+    outColor = texture(s_texture, v_texCoord);
 }
 )text";
 
@@ -46,12 +45,12 @@ struct Display
     int scale;
     int pitch;
     EGLDisplay s_display;
-	EGLContext s_context;
-	EGLSurface s_surface;
+    EGLContext s_context;
+    EGLSurface s_surface;
     GLuint vertexShader, fragmentShader;
-	GLuint shaderProgram;
-	GLint  samplerLoc;
-	GLuint textureId;
+    GLuint shaderProgram;
+    GLint  samplerLoc;
+    GLuint textureId;
 };
 
 GLuint loadShaderProgram(GLenum type, const char* source);

diff --git a/source/vm.c b/source/vm.c
@@ -44,8 +44,9 @@ void run(VM* vm)
     uint32_t cpuInstructionCount = 0;
 
     // Enforce the instructions per second limit in sync with the display refreshes
-    // 500,000 instructions per second is almost the same as 8064 instructions per 16 milliseconds
-    uint32_t instructionsPerSecondFactor = 62;
+    // 500,000 instructions per second is almost the same as 8064 instructions per 16 milliseconds.
+    // 500,000 IPS == 8064 instructions / 0.0016 seconds
+    uint32_t instructionsPerFrame = 8064;
 
     int wait = 0;
     Instruction* decoded = malloc(sizeof(Instruction));
@@ -68,17 +69,17 @@ void run(VM* vm)
             vm->pc++;
             cpuInstructionCount++;
 
-            if (cpuInstructionCount > INSTRUCTIONS_PER_SECOND / instructionsPerSecondFactor)
+            if (cpuInstructionCount > instructionsPerFrame)
                 wait = 1;
         }
-        if ((SDL_GetTicks() - cpuStartTime) > 1000 / instructionsPerSecondFactor)
+        if ((SDL_GetTicks() - cpuStartTime) > 16)
         {
             // 16 milliseconds have passed
             // Reset the instruction count and timer
-            if (cpuInstructionCount < INSTRUCTIONS_PER_SECOND / instructionsPerSecondFactor)
+            if (cpuInstructionCount < instructionsPerFrame)
             {
-                //printf("Running below desired instructions per second\n");
-                //printf("Desired: %d Actual: %d\n", INSTRUCTIONS_PER_SECOND / instructionsPerSecondFactor, cpuInstructionCount);
+                //printf("Running below desired instructions per frame\n");
+                //printf("Desired: %d Actual: %d\n", instructionsPerFrame, cpuInstructionCount);
             }
             cpuInstructionCount = 0;
             cpuStartTime = SDL_GetTicks();